Orifice Fittings

Sweco Fab, Inc. manufactures different kinds of high quality Orifice Plates and Flanges. They can be manufactured in SS304, SS316, and all other grades of S.S., C.S. Brass, Monel 400, Alloy 20, Inconel 600, 625 and 718, Nickel 200, Hastelloy C276 & B-2, Titanium Gr.2 and Zirc. 702.

1. Orifice plate, typically with a concentric bore, restricts the flow, thus allowing one to determine or calculate the volumetric or mass flow rate.

2. Sweco Fab has been supplying these orifice plates (with concentric, eccentric or segmental bore) in Stainless Steel or other alloy material. Orifice flanges, complete with bolts, nuts, jack screws, and gaskets can be supplied upon customer request.

3. Bore Calculations are available upon request with additional cost.

hbspt.forms.create({
portalId: “88145”,
formId: “4155c206-adb0-4aeb-8732-642070c4c83a”
});

Orifice Flange Unions

SWECO® Orifice Flange Unions consist of two facing flanges sandwiching a paddle or skillet type orifice plate with flange bolts. Both flanges are equipped with precisely located pressure taps which allow measurement of the pressure drop created by the orifice plate. The precise location of the pressure taps in conjunction with the precisely machined orifice hole allow the pressure drop to be converted to a flow value.
Orifice Flange Unions may be provided as any one of welding neck, slip-on or threaded flanges. Either flat gasket or ring-type gasket designed flange unions are possible.
SWECO® Fab Flange Unions are a complete set (as shown) consisting of two flanges, an orifice plate, gaskets, nuts, bolts, and jacking screws.

SWECO® Fab Flange Unions can be made to ASME B16.36, AGA, ISA or your own tolerances and specifications.

 

Paddle Type Orifice Plate Installation

SWECO® Paddle Style Orifice Plates (OP) are designed to fit between two specially modified flanges inside what is called an Orifice Flange Union (OFU). Orifice plates within OFUs are designed to create a restriction which causes the pressure of the fluid flowing through the pipe to drop. The drop in pressure varies directly with the flow of the fluid within the system.
Virtually any bore shape or configuration can be used to measure flow in a pipe, but the most common is a concentric (center) bore with a round hole having square, conical, or quadrant (radius) bore wall. No matter what the type of bore, the square edge goes upstream as shown in the diagram below.

The OFU will consist of the following parts:

1. Two special flanges facing each other (modified with jacking screws and ports).
2. Two gaskets
3. Studs and bolts
4. Your SWECO® Orifice Plate
5. Additionally, some OFUs have dowel pins to improve accuracy of alignment.

It is common for the OFU to have flanges with a material consistent with the pipeline and an Orifice Plate of stainless steel.
To install a new orifice plate in an existing installation refer to the exploded diagram on the next page and follow these steps:

Safety:
You should ensure that all flow to the OFU is blocked and locked out according to company policy. Wear proper Safety Gear.

Class 300 – RAISED FACE WELD NECK ORIFICE FLANGES

GENERAL NOTES:
(a) Dimensions are in inches.
(b) Weld neck flanges NPS 3 and smaller are dimensionally identical to Class 600 flanges and may be so marked.
(c) All other dimensions are in accordance with ASME B16.5.
NOTES:
(1) Other NPT sizes may be furnished if required.
(2) Bolt lengths include allowance for orifice and gasket thickness of 0.25 in. for NPS 1 to NPS 12 and 0.38 in. for NPS 14 to NPS 24.
(3) In conformance with ASME B16.5, stud bolt lengths do not include point heights.
(4) Bore diameter of weld neck flanges is to be specified by the purchaser.

Nominal pipe sizeOutside Dia. of Raised Face ROutside Dia. of Flange OMin. Thk. of Flange TfLength Through Hub Y1Diameter of Hub XHub Dia. Beginning of Chamfer ABore B1Dia. Of Pressure Connection TTBolt CircleNumber of HolesDia. of HolesDia. of BoltsMachine Bolt LengthStud Bolt Length
12.004.881.443.192.121.32Note 41/43.50411/165/84.505.00
1 1/22.886.121.443.312.751.90Note 41/44.50413/163/44.755.25
23.626.501.443.313.312.38Note 41/45.00811/165/84.505.00
2 1/24.127.501.443.443.942.88Note 41/45.88813/163/44.755.25
35.008.251.443.444.623.50Note 43/86.62813/163/44.755.25
46.1910.001.443.565.754.50Note 41/27.88813/163/44.755.25
68.5012.501.443.888.126.63Note 41/210.62127/83/44.755.25
810.6215.001.564.3110.258.63Note 41/213.001217/85.005.75
1012.7517.501.814.5612.6210.75Note 41/215.25161 1/815.756.50
1215.0020.501.945.0614.7512.75Note 41/217.75161 1/41 1/86.257.00
1416.2523.002.065.5616.7514.00Note 41/220.25201 1/41 1/86.507.25
1618.5025.502.195.6919.0016.00Note 41/222.50201 3/81 1/47.007.75
1821.0028.002.316.1921.0018.00Note 41/224.75241 3/81 1/47.258.00
2023.0030.502.446.3123.1220.00Note 41/227.00241 3/81 1/47.508.50
2427.2536.002.696.5627.6224.00Note 41/232.00241 3/81 1/28.259.50

Class 400 – RAISED FACE WELD NECK ORIFICE FLANGES

GENERAL NOTES:
(a) Dimensions are in inches.
(b) All other dimensions are in accordance with ASME B16.5.
(c) Ring joint flange in NPS 24 will require an angular meter tap as shown in Fig. 2.
NOTES:
(1) Other NPT sizes may be furnished if required.
(2) In conformance with ASME B16.5, stud bolt lengths do not include point heights.
(3) Bolt lengths for raised face flanges include allowance for orifice and gasket thickness of 0.25 in. for NPS 4 to NPS 12 and 0.38 in. for NPS 14 to NPS 24. Bolt lengths for ring-type
joint flanges include allowance of 0.62 in. for NPS 4 to NPS 10, 0.75 in. for NPS 12 to NPS 18, and 0.88 in. for NPS 20.
(4) Bore is to be specified by the purchaser.

Nominal pipe sizeOutside Dia. of Raised FaceOutside Dia. of FlangeMin. Thk. of FlangeLength Through HubDiameter of HubHub Dia. Beginning of ChamferBoreDia. Of Pressure ConnectionBolt CircleNumber of HolesDia. of HolesDia. of BoltsStud Bolt Length
ROTfY1XAB1TT
1For NPS 3 and Smaller use Class 600.
1 1/2
2
2 1/2
3
46.1910.001.503.505.754.50Note 41/27.8881.007/86.00
68.5012.501.624.068.126.63Note 41/210.62121.007/86.50
810.6215.001.884.6210.258.63Note 41/213.00121.1217.25
1012.7517.502.124.8812.6210.75Note 41/215.25161.251 1/88.00
1215.0020.502.255.3814.7512.75Note 41/217.75161.381 1/48.50
1416.2523.002.395.8816.7514.00Note 41/220.25201.381 1/49.00
1618.5025.502.506.0019.0016.00Note 41/222.50201.501 3/89.25
1821.0028.002.626.5021.0018.00Note 41/224.75241.501 3/89.50
2023.0030.502.756.6223.1220.00Note 41/227.00241.621 1/210.25
2427.2536.003.006.8827.6224.00Note 41/232.00241.881 3/411.50

Class 600 – RAISED FACE WELD NECK ORIFICE FLANGES

GENERAL NOTES:
(a) Dimensions are in inches.
(b) Weld neck flanges NPS 3 and smaller are dimensionally identical to Class 600 flanges and may be so marked.
(c) All other dimensions are in accordance with ASME B16.5.
NOTES:
(1) Other NPT sizes may be furnished if required.
(2) Bolt lengths include allowance for orifice and gasket thickness of 0.25 in. for NPS 1 to NPS 12 and 0.38 in. for NPS 14 to NPS 24.
(3) In conformance with ASME B16.5, stud bolt lengths do not include point heights.
(4) Bore diameter of weld neck flanges is to be specified by the purchaser.

Nominal pipe sizeOutside Dia. of Raised FaceOutside Dia. of FlangeMin. Thk. of FlangeLength Through HubDiameter of HubHub Dia. Beginning of ChamferBoreDia. Of Pressure ConnectionBolt CircleNumber of HolesDia. of HolesDia. of BoltsStud Bolt Length
ROTfY1XAB1TT
12.004.881.443.192.121.32Note 41/43.5040.695/85.00
1 1/22.886.121.443.322.751.90Note 41/44.5040.813/45.25
23.626.501.443.323.312.38Note 41/45.0080.695/85.00
2 1/24.127.501.443.443.942.88Note 41/45.8880.813/45.25
35.008.251.443.444.623.50Note 43/86.6280.813/45.25
46.1910.751.504.006.004.50Note 41/28.5081.007/86.50
68.5014.001.884.628.756.63Note 41/211.50121.1217.50
810.6216.502.195.2510.758.63Note 41/213.75121.251 1/88.25
1012.7520.002.506.0013.5010.75Note 41/217.00161.381 1/49.25
1215.0022.002.626.1215.7512.75Note 41/219.25201.381 1/49.50
1416.2523.752.756.5017.0014.00Note 41/220.75201.501 3/810.00
1618.5027.003.007.0019.5016.00Note 41/223.75201.621 1/210.75
1821.0029.253.257.2521.5018.00Note 41/225.75201.751 5/811.50
2023.0032.003.507.5024.0020.00Note 41/228.50241.751 5/812.50
2427.2537.004.008.0028.2524.00Note 41/233.00242.001 7/813.75

Class 900 – RAISED FACE WELD NECK ORIFICE FLANGES

GENERAL NOTES:
(a) Dimensions are in inches.
(b) All other dimensions are in accordance with ASME B16.5.
(c) Ring joint flanges larger than NPS 12 will require angular meter taps as shown in Fig. 2.
NOTES:
(1) Other NPT sizes may be furnished if required.
(2) In conformance with ASME B16.5, stud bolt lengths do not include point heights.
(3) Bolt lengths for raised face flanges include allowance for orifice and gasket thickness of 0.25 in. for NPS 3 to NPS 12 and 0.38 in. for NPS 14 to NPS 24. Bolt lengths for ring-type
joint flanges include allowance of 0.62 in. for NPS 3 to NPS 10 and 0.75 in. for NPS 12.
(4) Bore is to be specified by the purchaser.

Nominal pipe sizeOutside Dia. of Raised FaceOutside Dia. of FlangeMin. Thk. of FlangeLength Through HubDiameter of HubHub Dia. Beginning of ChamferBore B1Dia. Of Pressure ConnectionBolt CircleNumber of HolesDia. of HolesDia. of BoltsStud Bolt Length
ROTfY1XAB1TT
1For NPS 2 1/2 and smaller, use Class 1500
1 1/2
2
2 1/2
35.009.501.504.005.003.50Note 43/87.5081.007/86.00
46.1911.501.754.506.254.50Note 41/29.2581.251 1/87.00
68.5015.002.195.509.256.63Note 41/212.50121.251 1/87.75
810.6218.502.506.3811.758.63Note 41/215.50121.501 3/89.00
1012.7521.502.757.2514.5010.75Note 41/218.50161.501 3/89.50
1215.0024.003.127.8816.5012.75Note 41/221.00201.501 3/810.25
1416.2525.253.388.3817.7514.00Note 41/222.00201.621 1/211.00
1618.5027.753.508.5020.0016.00Note 41/224.25201.751 5/811.50
1821.0031.004.009.0022.2518.00Note 41/227.00202.001 7/813.00
2023.0033.754.259.7524.5020.00Note 41/229.50242.12214.00
2427.2541.005.5011.5029.5024.00Note 41/235.50242.622 1/217.50

Class 1500 – RAISED FACE WELD NECK ORIFICE FLANGES

GENERAL NOTES:
(a) Dimensions are in millimeters, except for bolts and bolt holes.
(b) All other dimensions are in accordance with ASME B16.5.
(c) Ring joint flanges larger than NPS 6 will require angular meter taps shown in Fig. 2.
NOTES:
(1) Other NPT sizes may be furnished if required.
(2) In conformance with ASME B16.5, stud bolt lengths do not include point heights.
(3) Bolt lengths for raised face flanges include allowance for orifice and gasket thickness of 6 mm (0.25 in.) for NPS 1 to NPS 12 and 10 mm (0.38 in.) for NPS 14 to NPS 24. Bolt
lengths for ring-type joint flanges include allowance of 15 mm (0.62 in.) for NPS 1 to NPS 6.
(4) Bore is to be specified by the purchaser.

Nominal pipe sizeOutside Dia. of Raised FaceOutside Dia. of FlangeMin. Thk. of FlangeLength Through HubDiameter of HubHub Dia. Beginning of ChamferBoreDia. Of Pressure ConnectionBolt CircleNumber of HolesDia. of HolesDia. of BoltsStud Bolt Length
ROTfY1XAB1TT
12.005.881.503.252.061.32Note 41/44.0041.007/86.00
1 1/22.887.001.503.502.751.90Note 41/44.8841.1216.25
23.628.501.504.004.122.38Note 41/46.5081.007/86.00
2 1/24.129.621.624.124.882.38Note 41/47.5081.1216.50
35.0010.501.884.625.253.50Note 43/88.0081.251 1/87.25
46.1912.252.124.886.384.50Note 41/29.5081.381 1/48.00
68.5015.503.256.759.006.63Note 41/212.50121.501 3/810.50
810.6219.003.628.3811.508.63Note 41/215.50121.751 5/811.75
1012.7523.004.2510.0014.5010.75Note 41/219.00122.001 7/813.50
1215.0026.504.8811.1217.7512.75Note 41/222.50162.12215.00
1416.2529.505.2511.7519.5014.00Note 41/225.00162.382 1/416.25
1618.5032.505.7512.2521.7516.00Note 41/227.75162.622 1/217.75
1821.0036.006.3812.8823.5018.00Note 41/230.50162.882 3/419.75
2023.0038.757.0014.0025.2520.00Note 41/232.75163.12321.50
2427.2546.008.0016.0030.0024.00Note 41/239.00163.623 1/224.50

Class 2500 – RAISED FACE WELD NECK ORIFICE FLANGES

GENERAL NOTES:
(a) Dimensions are in millimeters, except for bolts and bolt holes.
(b) All other dimensions are in accordance with ASME B16.5.
(c) Ring joint flanges larger than NPS 3 will require angular meter taps as shown in Fig. 2.
NOTES:
(1) Other NPT sizes may be furnished if required.
(2) In conformance with ASME B16.5, stud bolt lengths do not include point heights.
(3) Bolt lengths for raised face flanges include allowance for orifice and gasket thickness of 6 mm (0.25 in.) for NPS 1 to NPS 12. Bolt lengths for ring-type joint flanges include allowance
of 15 mm (0.62 in.) for NPS 1 to NPS 3.
(4) Bore is to be specified by the purchaser.

Nominal pipe sizeOutside Dia. of Raised FaceOutside Dia. of FlangeMin. Thk. of FlangeLength Through HubDiameter of HubHub Dia. Beginning of ChamferBoreDia. Of Pressure ConnectionBolt CircleNumber of HolesDia. of HolesDia. of BoltsStud Bolt Length
ROTfYXAB1TT
12.006.251.503.622.251.32Note 41/44.2541.007/86.00
1 1/22.888.001.754.383.121.90Note 41/45.7541.251 1/87.00
23.629.252.005.003.752.38Note 41/46.7581.1217.25
2 1/24.1210.502.255.624.502.38Note 41/47.7581.251 1/88.00
35.0012.002.626.625.253.50Note 43/89.0081.381 1/49.00
46.1914.003.007.506.504.50Note 41/210.7581.621 1/210.25
68.5019.004.2510.759.256.63Note 41/214.5082.12213.75
810.6221.755.0012.5012.008.63Note 41/217.25122.12215.25
1012.7526.506.5016.5014.7510.75Note 41/221.25122.622 1/219.25
1215.0030.007.2518.2517.3812.75Note 41/224.38122.882 3/421.25

Class 300 – RAISED FACE SLIP-ON ORIFICE FLANGES

GENERAL NOTES:
(a) Dimensions are in inches.
(b) Weld neck flanges NPS 3 and smaller are dimensionally identical to Class 600 flanges and may be so marked.
(c) All other dimensions are in accordance with ASME B16.5.
NOTES:
(1) Other NPT sizes may be furnished if required.
(2) For slip-on flanges, verify that TT drilling extends to inside diameter of pipe after assembly and is free from burrs.
(3) Bolt lengths include allowance for orifice and gasket thickness of 0.25 in. for NPS 1 to NPS 12 and 0.38 in. for NPS 14 to NPS 24.
(4) In conformance with ASME B16.5, stud bolt lengths do not include point heights.
(5) Bore diameter of weld neck flanges is to be specified by the purchaser.

Nominal pipe sizeOutside Dia. of Raised Face ROutside Dia. of Flange OMin. Thk. of Flange TfLength Through Hub Y1Diameter of Hub XHub Dia. Beginning of Chamfer ABore B1Dia. Of Pressure Connection TTBolt CircleNumber of HolesDia. of HolesDia. of BoltsMachine Bolt LengthStud Bolt Length
12.004.881.443.192.121.32Note 41/43.50411/165/84.505.00
1 1/22.886.121.443.312.751.90Note 41/44.50413/163/44.755.25
23.626.501.443.313.312.38Note 41/45.00811/165/84.505.00
2 1/24.127.501.443.443.942.88Note 41/45.88813/163/44.755.25
35.008.251.443.444.623.50Note 43/86.62813/163/44.755.25
46.1910.001.443.565.754.50Note 41/27.88813/163/44.755.25
68.5012.501.443.888.126.63Note 41/210.62127/83/44.755.25
810.6215.001.564.3110.258.63Note 41/213.001217/85.005.75
1012.7517.501.814.5612.6210.75Note 41/215.25161 1/815.756.50
1215.0020.501.945.0614.7512.75Note 41/217.75161 1/41 1/86.257.00
1416.2523.002.065.5616.7514.00Note 41/220.25201 1/41 1/86.507.25
1618.5025.502.195.6919.0016.00Note 41/222.50201 3/81 1/47.007.75
1821.0028.002.316.1921.0018.00Note 41/224.75241 3/81 1/47.258.00
2023.0030.502.446.3123.1220.00Note 41/227.00241 3/81 1/47.508.50
2427.2536.002.696.5627.6224.00Note 41/232.00241 3/81 1/28.259.50

Class 300 – RING JOINT ORIFICE FLANGES

GENERAL NOTES:
(a) Dimensions are in inches.
(b) Weld neck flanges NPS 3 and smaller are dimensionally identical to Class 600 flanges and may be so marked.
(c) All other dimensions are in accordance with ASME B16.5.
NOTES:
(1) Other NPT sizes may be furnished if required.
(2) For slip-on and threaded flanges, verify that TT drilling extends to inside diameter of pipe after assembly and is free from burrs.
(3) Bolt lengths include allowance for orifice and gasket thickness of 0.25 in. for NPS 1 to NPS 12 and 0.38 in. for NPS 14 to NPS 24.
(4) In conformance with ASME B16.5, stud bolt lengths do not include point heights.
(5) Bore diameter of weld neck flanges is to be specified by the purchaser.

Nominal pipe sizeOutside Dia. of Raised Face ROutside Dia. of Flange OMin. Thk. of Flange TfLength Through Hub Y1Diameter of Hub XHub Dia. Beginning of Chamfer ABore B1Dia. Of Pressure Connection TTBolt CircleNumber of HolesDia. of HolesDia. of BoltsMachine Bolt LengthStud Bolt Length
12.004.881.443.192.121.32Note 41/43.50411/165/84.505.00
1 1/22.886.121.443.312.751.90Note 41/44.50413/163/44.755.25
23.626.501.443.313.312.38Note 41/45.00811/165/84.505.00
2 1/24.127.501.443.443.942.88Note 41/45.88813/163/44.755.25
35.008.251.443.444.623.50Note 43/86.62813/163/44.755.25
46.1910.001.443.565.754.50Note 41/27.88813/163/44.755.25
68.5012.501.443.888.126.63Note 41/210.62127/83/44.755.25
810.6215.001.564.3110.258.63Note 41/213.001217/85.005.75
1012.7517.501.814.5612.6210.75Note 41/215.25161 1/815.756.50
1215.0020.501.945.0614.7512.75Note 41/217.75161 1/41 1/86.257.00
1416.2523.002.065.5616.7514.00Note 41/220.25201 1/41 1/86.507.25
1618.5025.502.195.6919.0016.00Note 41/222.50201 3/81 1/47.007.75
1821.0028.002.316.1921.0018.00Note 41/224.75241 3/81 1/47.258.00
2023.0030.502.446.3123.1220.00Note 41/227.00241 3/81 1/47.508.50
2427.2536.002.696.5627.6224.00Note 41/232.00241 3/81 1/28.259.50

Class 400 – RING JOINT ORIFICE FLANGES

GENERAL NOTES:
(a) Dimensions are in inches.
(b) All other dimensions are in accordance with ASME B16.5.
(c) Ring joint flange in NPS 24 will require an angular meter tap as shown in Fig. 2.
NOTES:
(1) Other NPT sizes may be furnished if required.
(2) In conformance with ASME B16.5, stud bolt lengths do not include point heights.
(3) Bolt lengths for raised face flanges include allowance for orifice and gasket thickness of 0.25 in. for NPS 4 to NPS 12 and 0.38 in. for NPS 14 to NPS 24. Bolt lengths for ring-type
joint flanges include allowance of 0.62 in. for NPS 4 to NPS 10, 0.75 in. for NPS 12 to NPS 18, and 0.88 in. for NPS 20.
(4) Bore is to be specified by the purchaser.

Nominal pipe sizeOutside Dia. of Raised FaceOutside Dia. of FlangeMin. Thk. of FlangeLength Through HubDiameter of HubHub Dia. Beginning of ChamferGroove No.Pitch Dia. PDia. Of Pressure Connection TTBolt CircleNumber of HolesDia. of HolesDia. of BoltsStud Bolt Length
ROTfYXAR RingPTT
1For NPS 3 and Smaller use Class 600.
1 1/2
2
2 1/2
3
46.1910.001.503.505.754.50R375.8751/27.8881.007/86
68.5012.501.624.068.126.63R458.3131/210.62121.007/86.5
810.6215.001.884.6210.258.63R4910.6251/213.00121.1217.25
1012.7517.502.124.8812.6210.75R5312.7501/215.25161.251 1/88
1215.0020.502.255.3814.7512.75R5715.0001/217.75161.381 1/48.5
1416.2523.002.395.8816.7514.00R6116.5001/220.25201.381 1/49
1618.5025.502.506.0019.0016.00R6518.5001/222.50201.501 3/89.25
1821.0028.002.626.5021.0018.00R6921.0001/224.75241.501 3/89.5
2023.0030.502.756.6223.1220.00R7323.0001/227.00241.621 1/210.25
2427.2536.003.006.8827.6224.00R7727.2501/232.00241.881 3/411.5

Class 600 – RING JOINT ORIFICE FLANGES

GENERAL NOTES:
(a) Dimensions are in inches.
(b) Weld neck flanges NPS 3 and smaller are dimensionally identical to Class 600 flanges and may be so marked.
(c) All other dimensions are in accordance with ASME B16.5.
NOTES:
(1) Other NPT sizes may be furnished if required.
(2) For slip-on and threaded flanges, verify that TT drilling extends to inside diameter of pipe after assembly and is free from burrs.
(3) Bolt lengths include allowance for orifice and gasket thickness of 0.25 in. for NPS 1 to NPS 12 and 0.38 in. for NPS 14 to NPS 24.
(4) In conformance with ASME B16.5, stud bolt lengths do not include point heights.
(5) Bore diameter of weld neck flanges is to be specified by the purchaser.

Nominal pipe sizeOutside Dia. of Raised FaceOutside Dia. of FlangeMin. Thk. of FlangeLength Through HubDiameter of HubHub Dia. Beginning of ChamferGroove No.Pitch Dia.Dia. Of Pressure Connection TTBolt CircleNumber of HolesDia. of HolesDia. of BoltsStud Bolt Length
ROTfY1XAR RingPTT
12.004.881.443.192.121.32R162.0001/43.5040.755/85.50
1 1/22.886.121.443.322.751.90R202.6881/44.5040.883/45.50
23.626.501.443.323.312.38R233.2501/45.0080.755/85.50
2 1/24.127.501.443.443.942.88R264.0001/45.8880.883/45.75
35.008.251.443.444.623.50R314.8753/86.6280.883/45.75
46.1910.751.504.006.004.50R375.8751/28.5081.007/86.50
68.5014.001.884.628.756.63R458.3131/211.50121.1217.50
810.6216.502.195.2510.758.63R4910.6251/213.75121.251 1/88.25
1012.7520.002.506.0013.5010.75R5312.7501/217.00161.381 1/49.25
1215.0022.002.626.1215.7512.75R5715.0001/219.25201.381 1/49.50
1416.2523.752.756.5017.0014.00R6116.5001/220.75201.501 3/810.00
1618.5027.003.007.0019.5016.00R6518.5001/223.75201.621 1/210.75
1821.0029.253.257.2521.5018.00R6921.0001/225.75201.751 5/811.50
2023.0032.003.507.5024.0020.00R7323.0001/228.50241.751 5/812.50
2427.2537.004.008.0028.2524.00R7727.2501/233.00242.001 7/813.75

Class 900 – RING JOINT ORIFICE FLANGES

GENERAL NOTES:
(a) Dimensions are in inches.
(b) All other dimensions are in accordance with ASME B16.5.
(c) Ring joint flanges larger than NPS 12 will require angular meter taps as shown in Fig. 2.
NOTES:
(1) Other NPT sizes may be furnished if required.
(2) In conformance with ASME B16.5, stud bolt lengths do not include point heights.
(3) Bolt lengths for raised face flanges include allowance for orifice and gasket thickness of 0.25 in. for NPS 3 to NPS 12 and 0.38 in. for NPS 14 to NPS 24. Bolt lengths for ring-type
joint flanges include allowance of 0.62 in. for NPS 3 to NPS 10 and 0.75 in. for NPS 12.
(4) Bore is to be specified by the purchaser.

Nominal pipe sizeOutside Dia. of Raised FaceOutside Dia. of FlangeMin. Thk. of FlangeLength Through HubDiameter of HubHub Dia. Beginning of ChamferGroove No.Pitch Dia.Dia. Of Pressure ConnectionBolt CircleNumber of HolesDia. of HolesDia. of BoltsStud Bolt Length
ROTfY1XAR RingPTT
1For NPS 2 1/2 and smaller, use Class 1500
1 1/2
2
2 1/2
35.009.501.504.005.003.50R314.8753/87.5081.007/86
46.1911.501.754.506.254.50R375.8751/29.2581.251 1/87
68.5015.002.195.509.256.63R458.3131/212.50121.251 1/87.75
810.6218.502.506.3811.758.63R4910.6251/215.50121.501 3/89
1012.7521.502.757.2514.5010.75R5312.7501/218.50161.501 3/89.5
1215.0024.003.127.8816.5012.75R5715.0001/221.00201.501 3/810.25
1416.2525.253.388.3817.7514.00R6216.5001/222.00201.621 1/211
1618.5027.753.508.5020.0016.00R6618.5001/224.25201.751 5/811.5
1821.0031.004.009.0022.2518.00R7021.0001/227.00202.001 7/813
2023.0033.754.259.7524.5020.00R7423.0001/229.50242.12214
2427.2541.005.5011.5029.5024.00R7827.2501/235.50242.622 1/217.5

Class 1500 – RING JOINT ORIFICE FLANGES

GENERAL NOTES:
(a) Dimensions are in millimeters, except for bolts and bolt holes.
(b) All other dimensions are in accordance with ASME B16.5.
(c) Ring joint flanges larger than NPS 6 will require angular meter taps shown in Fig. 2.
NOTES:
(1) Other NPT sizes may be furnished if required.
(2) In conformance with ASME B16.5, stud bolt lengths do not include point heights.
(3) Bolt lengths for raised face flanges include allowance for orifice and gasket thickness of 6 mm (0.25 in.) for NPS 1 to NPS 12 and 10 mm (0.38 in.) for NPS 14 to NPS 24. Bolt
lengths for ring-type joint flanges include allowance of 15 mm (0.62 in.) for NPS 1 to NPS 6.
(4) Bore is to be specified by the purchaser.

Nominal pipe sizeOutside Dia. of Raised FaceOutside Dia. of FlangeMin. Thk. of FlangeLength Through HubDiameter of HubHub Dia. Beginning of ChamferGroove No.Pitch Dia.Dia. Of Pressure ConnectionBolt CircleNumber of HolesDia. of HolesDia. of BoltsStud Bolt Length
ROTfYXAR RingPTT
12.005.881.503.252.061.32R162.0001/44.0041.007/86.00
1 1/22.887.001.503.502.751.90R202.6881/44.8841.1216.25
23.628.501.504.004.122.38R243.7501/46.5081.007/86.00
2 1/24.129.621.624.124.882.38R274.2501/47.5081.1216.50
35.0010.501.884.625.253.50R355.3753/88.0081.251 1/87.25
46.1912.252.124.886.384.50R396.3751/29.5081.381 1/48.00
68.5015.503.256.759.006.63R468.3121/212.50121.501 3/810.50
810.6219.003.628.3811.508.63R5010.6251/215.50121.751 5/811.75
1012.7523.004.2510.0014.5010.75R5412.7501/219.00122.001 7/813.50
1215.0026.504.8811.1217.7512.75R5815.0001/222.50162.12215.00
1416.2529.505.2511.7519.5014.00R6316.5001/225.00162.382 1/416.25
1618.5032.505.7512.2521.7516.00R6718.5001/227.75162.622 1/217.75
1821.0036.006.3812.8823.5018.00R7121.0001/230.50162.882 3/419.75
2023.0038.757.0014.0025.2520.00R7523.0001/232.75163.12321.50
2427.2546.008.0016.0030.0024.00R7927.2501/239.00163.623 1/224.50

Class 2500 – RING JOINT ORIFICE FLANGES

GENERAL NOTES:
(a) Dimensions are in millimeters, except for bolts and bolt holes.
(b) All other dimensions are in accordance with ASME B16.5.
(c) Ring joint flanges larger than NPS 3 will require angular meter taps as shown in Fig. 2.
NOTES:
(1) Other NPT sizes may be furnished if required.
(2) In conformance with ASME B16.5, stud bolt lengths do not include point heights.
(3) Bolt lengths for raised face flanges include allowance for orifice and gasket thickness of 6 mm (0.25 in.) for NPS 1 to NPS 12. Bolt lengths for ring-type joint flanges include allowance
of 15 mm (0.62 in.) for NPS 1 to NPS 3.
(4) Bore is to be specified by the purchaser.

Nominal pipe sizeOutside Dia. of Raised FaceOutside Dia. of FlangeMin. Thk. of FlangeLength Through HubDiameter of HubHub Dia. Beginning of ChamferGroove No.Pitch Dia.Dia. Of Pressure ConnectionBolt CircleNumber of HolesDia. of HolesDia. of BoltsStud Bolt Length
ROTfYXAR RingPTT
12.006.251.503.622.251.32R182.3751/44.2541.007/86.00
1 1/22.888.001.754.383.121.90R233.2501/45.7541.251 1/87.00
23.629.252.005.003.752.38R264.0001/46.7581.1217.25
2 1/24.1210.502.255.624.502.38R284.3751/47.7581.251 1/88.00
35.0012.002.626.625.253.50R325.0003/89.0081.381 1/49.00
46.1914.003.007.506.504.50R386.1881/210.7581.621 1/210.25
68.5019.004.2510.759.256.63R479.0001/214.5082.12213.75
810.6221.755.0012.5012.008.63R5111.0001/217.25122.12215.25
1012.7526.506.5016.5014.7510.75R5513.5001/221.25122.622 1/219.25
1215.0030.007.2518.2517.3812.75R6016.0001/224.38122.882 3/421.25

Class 300 – RTJ Restriction Orifice Plates

LINE SIZERING SIZEAB
1/2"R-1129/32"4 1/4"
3/4"R-131"4 1/4"
1"R-161"4 1/4"
1 1/2"R-201"4 1/4"
2"R-231 1/16"4 1/4"
2 1/2"R-261 1/16"4 1/4"
3"R-311 1/16"4 1/4"
3 1/2"R-341 1/16"4 1/4"
4"R-371 1/16"4 1/4"
5"R-411 1/16"4 1/4"
6"R-451 1/16"4 1/4"
8"R-491 1/16"4 1/4"
10"R-531 3/16"7 1/2"
12"R-571 3/16"7 1/2"
14"R-611 3/16"7 1/2"
16"R-651 3/16"7 1/2"
18"R-691 3/16"7 1/2"
20"R-731 1/4"7 1/2"
24"R-771 7/16"7 1/2"

Class 600 – RTJ Restriction Orifice Plates

LINE SIZERING SIZEAB
1/2"R-1129/32"4 1/4"
3/4"R-131"4 1/4"
1"R-161"4 1/4"
1 1/2"R-201"4 1/4"
2"R-231 1/16"4 1/4"
2 1/2"R-261 1/16"4 1/4"
3"R-311 1/16"4 1/4"
3 1/2"R-341 1/16"4 1/4"
4"R-371 1/16"4 1/4"
5"R-411 1/16"4 1/4"
6"R-451 1/16"4 1/4"
8"R-491 1/16"4 1/4"
10"R-531 3/16"7 1/2"
12"R-571 3/16"7 1/2"
14"R-611 3/16"7 1/2"
16"R-651 3/16"7 1/2"
18"R-691 3/16"7 1/2"
20"R-731 1/4"7 1/2"
24"R-771 7/16"7 1/2"

Class 900 – RTJ Restriction Orifice Plates

LINE SIZERING SIZEAB
1/2"R-121"4 1/4"
3/4"R-141"4 1/4"
1"R-161"4 1/4"
1 1/2"R-201"4 1/4"
2"R-241 1/16"5 1/4"
2 1/2"R-271 1/16"5 1/4"
3"R-311 1/16"5 1/4"
3 1/2"-1 1/16"5 1/4"
4"R-371 1/16"5 1/4"
R-411 1/16"6 1/4"
6"R-451 1/16"6 1/4"
8"R-491 1/16"6 1/2"
10"R-531 3/16"7 1/2"
12"R-571 3/16"7 1/2"
14"R-621 7/167 1/2"
16"R-661 7/167 1/2"
18"R-701 9/16"7 1/2"
20"R-741 9/16"7 1/2"
24"R-781 7/8"9 1/2"

Class 1500 – RTJ Restriction Orifice Plates

LINE SIZERING SIZEAB
1/2"R-121"6 1/2"
3/4"R-141"6 1/2"
1"R-161"6 1/2"
1 1/2"R-201"6 1/2"
2"R-241 11/16"6 1/2"
2 1/2"R-271 11/16"6 1/2"
3"R-351 11/16"6 1/2"
4"R-391 11/16"6 1/2"
5"R-441 11/16"6 1/2"
6"R-461 3/16"6 1/2"
8"R-501 5/16"6 1/2"
10"R-541 7/16"7 1/2"
12"R-581 11/168 1/2"
14"R-631 7/8"8 1/2"
16"R-672"9 1/2"
18"R-712"9 1/2"
20"R-752 1/8"10 1/2
24"R-792 5/16"11 1/2

Class 2500 – RTJ Restriction Orifice Plates

LINE SIZERING SIZEAB
1/2"R-131"6 1/2"
3/4"R-161"6 1/2"
1"R-181"6 1/2"
1 1/2"R-231 1/16"6 1/2"
2"R-261 3/16"6 1/2"
2 1/2"R-281 3/16"6 1/2"
3"R-321 3/16"6 1/2"
3 1/2"-1 3/16"6 1/2"
4"R-381 5/16"6 1/2"
5"R-421 7/167 1/2"
6"R-471 7/167 1/2"
8"R-511 9/16"8 1/2"
10"R-552"8 1/2"
12"R-602 1/8"9 1/2"

Paddle Style Orifice Plate

NPSDIMENSION “A”BCTHICK
CL 150CL 300CL 600CL 900CL 1500CL 2500
1/21 7/82 1/82 1/82 1/22 1/22 3/441.000.125
3/42 1/42 5/82 5/82 3/42 3/4341.000.125
12 5/82 7/82 7/83 1/83 1/83 3/841.000.125
1.53 3/83 3/43 3/43 7/83 7/84 5/841.000.125
24 1/84 3/84 3/85 5/85 5/85 3/441.000.125
35 3/85 7/85 7/86 5/86 7/87 3/441.000.125
46 7/87 1/87 5/88 1/88 1/49 1/441.000.125
68 3/49 7/810 1/211 3/811 1/812 1/861.000.125
81112 1/812 5/814 1/813 7/815 1/461.500.125
1013 3/814 1/415 3/417 1/817 1/818 3/461.500.125
1216 1/816 5/81819 5/820 1/221 5/861.500.125
1417 3/419 1/819 3/820 1/222 3/461.500.250
1620 1/421 1/422 1/422 5/825 1/461.500.250
1821 1/223 3/8242527 5/861.500.250
2023 3/425 5/826 3/427 3/829 5/861.500.375
2428 1/830 3/83132 7/835 1/261.500.375

Paddle Type Restriction Orifice Plate

NPSDIMENSION “A”BCTHICK
CL 150CL 300CL 600CL 900CL 1500CL 2500
1/21 7/82 1/82 1/82 1/22 1/22 3/441.000.125
3/42 1/42 5/82 5/82 3/42 3/4341.000.125
12 5/82 7/82 7/83 1/83 1/83 3/841.000.125
1.53 3/83 3/43 3/43 7/83 7/84 5/841.000.125
24 1/84 3/84 3/85 5/85 5/85 3/441.000.125
35 3/85 7/85 7/86 5/86 7/87 3/441.000.125
46 7/87 1/87 5/88 1/88 1/49 1/441.000.125
68 3/49 7/810 1/211 3/811 1/812 1/861.000.125
81112 1/812 5/814 1/813 7/815 1/461.500.125
1013 3/814 1/415 3/417 1/817 1/818 3/461.500.125
1216 1/816 5/81819 5/820 1/221 5/861.500.125
1417 3/419 1/819 3/820 1/222 3/461.500.250
1620 1/421 1/422 1/422 5/825 1/461.500.250
1821 1/223 3/8242527 5/861.500.250
2023 3/425 5/826 3/427 3/829 5/861.500.375
2428 1/830 3/83132 7/835 1/261.500.375

Socket-weld Restriction Coupling

PRESSURE CLASS 3000PRESSURE CLASS 6000
Nom.
Pipe Size
Pipe
Bore (Ref)
ABCDNom.
Pipe Size
Pipe
Bore (Ref)
ABCD
1/80.2690.750.4201.130.38
1/40.3640.880.5551.130.38
3/80.4931.130.6901.130.383/80.3441.250.6901.130.38
1/20.6221.000.8551.380.381/20.4641.500.8551.250.38
3/40.8241.251.0651.500.633/40.6121.751.0651.500.63
11.0491.881.3301.630.6310.8152.251.3301.630.63
1 1/41.3802.251.6751.630.631 1/41.1602.501.6751.630.63
1 1/21.6102.501.9151.630.631 1/21.3383.001.9151.630.63
22.0673.002.4062.130.7521.6873.632.4062.130.75
2 1/22.4693.632.9062.130.752 1/22.1254.252.9062.130.75
33.0684.383.5352.130.7532.6245.003.5352.130.75
44.0265.504.5452.380.7543.4386.254.5452.380.75
Top